How to stop this code from throwing error?

Programming Questions

fari

How to stop this code from throwing error?

in Programming Questions • 3 months ago

To those who can help me

I am accessing TagDef API. A sample piece of code is:

String[] s = loadStrings("http://api.tagdef.com/one.FollowMeKendall.json");
println(s);

But when the URL is not accessible, it gives me errors. But I don't have any other choice, I have to submit requests even if the URLs are not valid. I just want this code to stop giving me errors like below:

null
The file "http://api.tagdef.com/one.FollowMeKendall.json" is missing or inaccessible, make sure the URL is valid or that the file has been added to your sketch and is readable.

even when I use if(s!=null) , the error is still thrown.

Replies(4)

dlillard5

Re: How to stop this code from throwing error?

3 months ago

While your code does throw an error, its really more like Processing is just warning you that your loadStrings() didn't work. Your code can still continue to run despite the "error". Just make sure your sketch can handle null values coming from loadStrings(), and you should be fine.

benj.n.su..

Re: How to stop this code from throwing error?

3 months ago

as dillard5 said, it's not a problem. you can still use (s != null) to run some code only if s is not null, else do not run the code.

if the error is still abother to you aesthetically, maybe using a library such as as this will help:

http://docs.oracle.com/javase/7/docs/api/java/net/HttpURLConnection.html

What I'm wondering is if you can get a response and if the response is anything but 404, then you would load the strings.

PhiLho

Re: How to stop this code from throwing error?

3 months ago

Perhaps try the solution given in https://forum.processing.org/topic/verify-if-urls-of-pdf-documents-are-valids

fari

Re: How to stop this code from throwing error?

3 months ago

Thank you all. I am now checking for Response Code, if it is not 404, then I am executing the code:

import java.net.*;
String request = "http://api.tagdef.com/one.bee33eb.json";
try {
URL url = new URL(request);
HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
int statusCode = urlConn.getResponseCode();
println(statusCode);
}
catch (IOException e) {
System.err.println("Error creating HTTP connection");
e.printStackTrace();
}

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